import java.util.Scanner;

public class HJ76 {
    public static void main(String[] args) {
        Scanner sc = null;
        try {
            sc = new Scanner(System.in);
            while (sc.hasNext()) {
                int input = sc.nextInt();
                System.out.println(getSequeOddNum(input));
            }
        } finally {
            if (sc != null) {
                sc.close();
            }
        }
    }

    private static String getSequeOddNum(int src) {
        int start = src * src - src + 1;
        StringBuilder sb = new StringBuilder(String.valueOf(start));
        for (int i=1; i<src; i++) {
            int cur = start + i*2;
            sb.append('+').append(cur);
        }
        return sb.toString();
    }
}
